CN204562254U - Medical stapler - Google Patents

Abstract

The utility model discloses a medical stapler, which comprises a rack arranged at the proximal end of a push rod of a staple magazine; a gear meshed with the rack, which includes an accommodating space and a connected first groove; The braking part in the space, the braking part has a second groove; the elastic element arranged in the second groove; the anti-overflow needle push rod has a protrusion, and the protrusion abuts against the elastic element; when the anti-overflow needle When the push rod and the staple cartridge push rod remain relatively stationary, the protrusion enters the first groove of the gear under the action of the elastic element, and at this time the brake, the gear and the rack are relatively stationary; when the anti-overflow needle push rod is relatively When the staple cartridge push rod moves toward the distal end of the medical stapler, the protrusion compresses the elastic element so that the protrusion breaks away from the first groove, and acts on the gear to rotate on the rack. The medical stapler of the utility model can conveniently push the anti-overflow needle manually, so as to realize the early closure of the suture cutting area, and the medical stapler of the utility model can realize manual and automatic operation at the same time.

Description

Medical Stapler

technical field

The utility model belongs to the technical field of medical equipment manufacturing, in particular to a medical stapler.

Background technique

Surgical fixation and cutting of physiological tissue is a very common need in the surgical field. Low rectal cancer refers to malignant tumors of rectal epithelial tissue within 5cm from the dentate line. Miles surgery (abdomen-perineal combined with radical rectal cancer resection) was used to treat it before, but the resection range is wide and the functional damage is large, so permanent rectal cancer is required. Ostomy seriously affects postoperative life and quality of life of patients. Low anterior resection (LAR) of rectal cancer was gradually accepted by surgeons in the middle of the 20th century. The biggest advantage of anterior resection of low rectal cancer is that it preserves the function of the anal sphincter, avoids permanent colostomy, and improves the quality of life of patients. However, the anterior resection of low rectal cancer needs to be extended into the patient's pelvis, and the operation space is small, especially the male pelvis is narrower than the female pelvis, and the operation is difficult. Therefore, arc-shaped staplers have appeared to meet the needs of cutting off cancerous rectal tissue in a small operating space. The existing medical arc-shaped stapler includes an anti-overflow needle assembly, which is used to prevent the physiological tissue from being unable to be positioned between the staple cartridge assembly and the anvil assembly when cutting physiological tissues. At present, the push and pull of the anti-overflow needle assembly is mainly done by automatic means. However, in actual operation, the push and pull of the anti-overflow needle assembly sometimes needs to be adjusted manually.

Contents of the invention

The purpose of the utility model is to provide a medical stapler, which solves the problem of inconvenient manual adjustment of the anti-overflow needle assembly during the pushing and pulling process.

In order to achieve one of the purposes of the above-mentioned utility model, an embodiment of the utility model provides a medical stapler, including an anvil, an overflow prevention needle, and a staple magazine push rod, wherein the anvil includes an anvil that allows the passage of human physiological tissues. A receiving port, the spill prevention needle can move between a first position for opening the receiving port and a second position for closing the receiving port, the medical stapler includes:

The rack is arranged at the proximal end of the staple cartridge push rod, and the rack extends from the proximal end to the distal end of the staple cartridge push rod;

a hollow gear meshing with the rack, including a housing space, and a first groove communicating with the housing space;

a brake piece, the brake piece is arranged in the accommodating space, and the brake piece has a second groove;

an elastic element is disposed in the second groove; and

An anti-overflow needle push rod, which has a bump on the anti-overflow needle push rod, and the bump abuts against the elastic element;

Wherein, when the anti-overflow needle push rod and the staple cartridge push rod remain relatively stationary, the protrusion protrudes out of the second groove under the action of the elastic element and enters into the gear. The first groove, at this time, the brake member, the gear and the rack are relatively stationary; when the anti-overflow needle push rod moves toward the distal end of the medical stapler relative to the staple cartridge push rod , the protrusion compresses the elastic element so that the protrusion disengages from the first groove, and acts on the gear to rotate on the rack.

As a further improvement of an embodiment of the present utility model, the inner surface of the accommodating space is arc-shaped, and the outer surface of the braking member corresponding to the accommodating space is an arc matching the inner surface of the accommodating space shape.

As a further improvement of an embodiment of the present invention, the first groove penetrates through the gear in the axial direction of the gear.

As a further improvement of an embodiment of the present invention, the second groove penetrates through the brake part in the axial direction of the brake part.

As a further improvement of an embodiment of the present invention, the opening width of the first groove is equal to the opening width of the second groove.

As a further improvement of an embodiment of the present invention, the inner diameter of the first groove is equal to the inner diameter of the second groove.

As a further improvement of an embodiment of the present invention, the depth of the first groove in the radial direction of the gear is smaller than the width of the protrusion; the depth of the second groove in the radial direction of the gear is larger than the The width of the bump.

As a further improvement of an embodiment of the present invention, the first groove and the second groove are both rectangular grooves.

As a further improvement of an embodiment of the present utility model, the elastic element is a leaf spring.

As a further improvement of an embodiment of the present utility model, a force application handle is provided on the anti-overflow needle push rod, and the protrusion is arranged at a distal end of the force application handle.

Compared with the prior art, the utility model has the beneficial effect that: the utility model uses the gear and the brake part as the connecting part between the anti-overflow needle push rod and the nail magazine push rod, and can realize the manual advancement of the anti-overflow needle, thereby Realize the early closure of the suturing and cutting area, and the medical stapler of the utility model can realize manual and automatic operation at the same time.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a medical stapler according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of an explosion structure of a medical stapler according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of the exploded structure of the nail cartridge assembly and the nail anvil assembly in an embodiment of the present invention;

Fig. 4 is a partial structural schematic diagram of the nail cartridge assembly and the nail anvil assembly in an embodiment of the present invention;

Fig. 5 is a schematic diagram of a partial structure of a medical stapler according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of a partial structure of a medical stapler according to an embodiment of the present invention;

Fig. 7 is a schematic diagram of the enlarged structure of the automatic state of the medical stapler in area A in Fig. 6;

Fig. 8 is an enlarged structural schematic diagram of the manual state of the medical stapler in area A in Fig. 6 .

Detailed ways

The utility model will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present utility model, and the structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present utility model.

The words expressing position and direction described in the utility model all refer to the operator of the instrument, the end close to the operator is the proximal end, and the end far away from the operator is the distal end.

1 to 4, the medical stapler 100 is used to apply multiple staples (not shown) to the physiological tissues of the human body. In this embodiment, it is further preferred to cut the corresponding physiological tissues at the same time. . The stapler 100 includes a firing assembly 40, an anvil block 11, an anvil assembly 13, and a staple cartridge assembly 12. The firing assembly 40 includes a staple cartridge push rod 31 that is drivingly connected to the staple cartridge assembly 12. The staple cartridge assembly 12 is detachably Installed on the far end of the staple cartridge push rod 31.

The anvil block 11 , the anvil assembly 13 and the staple cartridge assembly 12 are integrally configured in an arc shape, so as to operate physiological tissues in a smaller operable space. The nail anvil assembly 13 is connected with the nail anvil 11 through secondary assembly, and the nail cartridge assembly 12 is driven by the firing assembly 40 through the nail cartridge push rod 31 from the proximal end of the nail anvil 11 along the direction defined by the nail anvil 11 Moving to the distal end, the closing operation of the staple cartridge assembly 12 is realized.

The staple cartridge assembly 12 has a staple cartridge 121. The staple cartridge 121 includes a staple cartridge surface 126 and one or more rows of a plurality of staple receiving grooves 127 arranged in a staggered manner. The staple cartridge 121 is also provided with a self-sewing nail. The nail pushing piece 122 released in the nail receiving groove 127 and a cutting knife 124 installed on the knife rest 123, the nail bin surface 126 and the nail pushing piece 122 are respectively provided with slits adapted to the cutting knife 124 (not shown). shown) to support the firing operation of the cutter 124. Preferably, the above-mentioned staple receiving grooves 127 are located on both sides of the cutting knife 124, so that, during the cutting and suturing of intestinal tissue, for example, the two ends of the severed intestinal tract can be sutured simultaneously.

After a cutting and suturing process is finished, the instrument is opened by pressing the release button 46, so that the instrument is taken out from the operation site. Of course, for the same patient, if it is necessary to use this type of instrument again for cutting and suturing in other parts during the operation, the new staple cartridge assembly 12 can be replaced to perform the next cutting and suturing. In a preferred embodiment of the staple cartridge assembly 12, the staple cartridge assembly 12 is equipped with a staple cartridge cover 125 for blocking the staples in the staple cartridge 121 and the cutter 124 to prevent missed staples and false firing. And, the distal end of nail bin assembly 12 is also preferably connected with nail anvil assembly 13 and knife anvil assembly 14, when nail bin assembly 12 is installed on nail bin push rod 31 far-end, this nail anvil assembly 13 and knife The anvil assembly 14 can be fitted on the mounting frame 112 of the nail anvil, so that after a cutting and suturing process is completed, the staples in the staple bin assembly 12, the cutter 124, the staples corresponding to the staples and the cutter 124 respectively The anvil assembly 13 and the anvil assembly 14 are configured as integral assemblies that can be replaced in time.

The supporting structure 20 of nail anvil 11 comprises a pair of left side and right side support 21,22 that is arranged oppositely, and left side and right side support 21,22 are respectively provided with the pin hole on the nail anvil 11 and its top. The mounting holes 211 and 221 are matched with the preset protrusions 111 to realize mutual fixing of the anvil 11 and the supporting structure 20 . The other end of the supporting structure 20 is connected to the handle 60 . Adaptively, the handle 60 includes left and right housings 61 , 62 for correspondingly connecting the left and right supports 21 , 22 .

Part of the firing assembly 40 is pivotally connected to the proximal end of the support structure 20 , specifically, the firing assembly 40 includes a handle 41 , a front link 42 , a rear link 43 , a rotating crank 44 , and a staple cartridge push rod 31 . The far end of the front link 42 is connected to the staple cartridge push rod 31, and the proximal end is pivotally connected to the rear link 43; the other end of the rear link 43 is connected to the support structure 20; the rotating crank 44 is pivotally connected to the support The structure 20 is also pivotally connected to the staple cartridge push rod 31 , and the rotating crank 44 supports the staple cartridge push rod 31 . In the initial state, the front connecting rod 42 and the rear connecting rod 43 are arranged at an angle less than 180 degrees, and the connecting part of the front connecting rod 42 and the rear connecting rod 43 is against a supporting portion 411 on the handle 41 . During the process of fixing human physiological tissue between the nail anvil assembly 13 and the nail bin surface 126 of the nail bin 121, the handle 41 is pivotally turned toward the handle 60, and the supporting part 411 acts against the front connecting rod 42 and the rear connecting rod 42. The connecting portion of the rod 43, the front link 42 and the rear link 43 are forced to move toward a state that tends to increase the angle between them. In this embodiment, the front link 42 and the rear link 43 can preferably be acted on at most to a relatively stable mating state with an angle of slightly more than 180 degrees, that is, the front link 42 and the rear link 43 move to both The clip is 180° and then continues to move, and finally abuts against the abutment portion 213 of the support structure 20. In the process, the distance defined between the far end of the front link 42 and the proximal end of the rear link 43 gradually After increasing to the maximum distance, it decreases slightly. Since one end of the rear connecting rod 43 is fixed on the support structure 20, the far end of the front connecting rod 42 realizes driving the staple cartridge push rod 31 to move toward the distal end, and the staple cartridge push rod 31 moves toward the far end. The driving force acting on the staple cartridge assembly 12 causes the staple cartridge assembly 12 to be forced to approach the nail anvil assembly 13 to achieve clipping of physiological tissues.

The stapler 100 also includes an anti-overflow needle assembly, which includes a saddle-shaped anti-overflow needle push rod 51 on the top surface of the handle, an anti-overflow needle 53, and an anti-overflow needle clamp 54 fixedly connected with the anti-overflow needle 53 , the push rod 52, the push rod 52 is connected with the anti-overflow needle 53 pierced in the staple cartridge assembly 12 through the anti-overflow needle clip 54, and the operation of the saddle-shaped anti-overflow needle push rod 51 will cause the push rod 52 to move to the distal end, Distal movement or proximal retraction of the push rod 52 will result in a corresponding movement of the anti-spill needle 53 . In this way, while completing the above-mentioned physiological tissue fixation, it is ensured that the physiological tissue will not overflow the suturing and cutting area defined by the staple cartridge assembly 12 and the staple anvil assembly 13 . Wherein, the nail anvil 11 has a receiving port 70 that allows the passage of human physiological tissues, and the anti-overflow needle assembly can move between a first position that opens the receiving port 70 and a second position that closes the receiving port 70 . The first position is that the suture cutting area defined by the staple cartridge assembly 12 and the staple anvil assembly 13 is in an open state, and the second position is that the suture cutting area defined by the staple cartridge assembly 12 and the staple anvil assembly 13 is in a closed state.

The firing assembly 40 also includes a nail pusher 32, which is slidably fitted in the nail cartridge pusher 31, and the surfaces on which the nail pusher 32 and the knife rest 123 act are made to fit each other. In this embodiment, Adaptively bowed. A wedge-shaped piece 412 is connected to the handle 41 , and the wedge-shaped piece 412 can be at least partially assembled in the staple cartridge push rod 31 to realize interaction with the staple push rod 32 . After the above-mentioned fixing operation on human physiological tissues is completed, the handle 41 is driven by the handle return spring (not shown) to rotate in a direction away from the handle to realize the automatic reset of the handle. During this process, the wedge-shaped piece 412 on the handle 41 Triggered against the pusher rod 32, at this time, by pivoting the handle 41 toward the direction of the handle 60, the wedge-shaped piece 412 will push the pusher rod 32 to move to the distal end, realizing the alignment between the cutter 124 and the pusher rod. Simultaneously firing the pieces 122, the staple pushing piece 122 pushes the staples in the staple receiving groove 127 to tighten on the human tissue, and at the same time, the cutter 124 cuts the corresponding human tissue. The proximal end of the pusher rod 32 has a clasp (not shown) extending out of the staple cartridge push rod 31, a spring 45 is connected between the clasp and the support structure 20, and the pusher rod 32 is During the firing process, the spring 45 is in a stretched state, and when the firing is completed, the spring 45 pulls back the nail push rod 32 under the action of its own tension, and simultaneously pulls back the knife rest 123 provided with the cutting knife 124, In this way, the entire firing process of the instrument is completed.

After one cutting and suturing action is completed, the staple cartridge assembly 12 can be retracted through the release button 46 . Specifically, the release button 46 is movably connected to the support structure 20 through a release button pin 47 , and the proximal end of the rear link 43 can also be relatively fixed to the support structure 20 through the connection with the release button pin 47 . The far end of the release button 46 has an abutment end 461 that can act on the rear link 43. When the release button 46 is pressed, the abutment end 461 will drive the front link 42 and the rear link 43 to form an angle less than 180 degrees. State movement destroys the relatively stable mating state of the front connecting rod 42 and the rear connecting rod 43, and then pulls the staple cartridge push rod 31 and the staple cartridge assembly 12 back to the relatively proximal end, and the operator can take the instrument out of the surgical site at this time .

As shown in Figures 5 to 8, the medical stapler also includes a rack 81, a hollow gear 82, a braking member 83, and an elastic element 84; the rack 81 is arranged at the proximal end of the staple cartridge push rod 31, and the The rack 81 extends from the proximal end to the distal end of the staple cartridge push rod 31; the gear 82 meshes with the rack 81, and the gear 82 includes an accommodating space 821 and a second accommodating space 821 communicated with the accommodating space 821. A groove 8211; the braking member 83 is disposed in the accommodating space 821, and the braking member 83 has a second groove 831; the elastic element 84 is disposed in the second groove 831; the There is a protrusion 511 on the anti-overflow needle push rod, and the protrusion 511 abuts against the elastic element 84; wherein, when the anti-overflow needle push rod and the staple cartridge push rod 31 remain relatively stationary, the Under the action of the elastic element 84, the protrusion 511 protrudes out of the second groove 831 and enters the first groove 8211 of the gear 82. At this time, the brake member 83, the gear 82 and the rack 81 are relatively stationary; when the anti-overflow needle push rod moves toward the distal end of the medical stapler relative to the staple cartridge push rod 31, the protrusion 511 compresses the elastic element 84 so that The protrusion 511 disengages from the first groove 8211 and acts on the gear 82 to rotate on the rack 81 .

Wherein, operating the saddle-shaped anti-overflow needle push rod 51 will cause the push rod 52 to move distally, and the push rod 52 pushes the anti-overflow needle 53 to move far-end. Handle 512, the force application handle 512 is arranged on the two wings of the saddle-shaped anti-overflow needle push rod 51, the protrusion 511 is arranged on the far end of the force application handle 512, and the push rod 52 moves to the distal end or shrinks to the proximal end. This will result in a corresponding movement of the anti-spill needle 53.

In this embodiment, the inner surface of the accommodating space 821 is arc-shaped, and the outer surface of the braking member 83 corresponding to the accommodating space 821 is a circle matching the inner surface of the accommodating space 821. arc. The diameter of the stopper 83 and the diameter of the accommodating space 821 may be approximately the same, so that the gear 82 can rotate relative to the stopper 83 , and at the same time the gear 82 and the stopper 83 do not disengage from each other.

In this embodiment, the first groove 8211 penetrates the gear 82 in the axial direction of the gear 82 , and the second groove 831 penetrates the braking member 83 in the axial direction. 83, the protrusion 511 on the saddle-shaped anti-overflow needle push rod 51 can enter the first groove 8211 and the second groove 831 from the opening in the axial direction, but it is not limited thereto, for example, the first groove 8211 can only pass through the gear 82 on the side where the protrusion 511 enters, and the other side does not penetrate the gear 82. Similarly, the second groove 831 can only penetrate the stopper 83 on the side where the protrusion 511 enters, and the other side does not penetrate the gear 82. The other side does not pass through the stopper 83 . The opening width of the first groove 8211 is equal to the opening width of the second groove 831, that is, the opening width of the first groove 8211 is equal to the opening width of the second groove 831, further, the inner diameter of the first groove 8211 can be equal to the inner diameter of the second groove 831 . The depth of the first groove 8211 in the radial direction of the gear 82 is smaller than the width of the protrusion 511 , and at the same time, the depth of the second groove 831 in the radial direction of the gear 82 is greater than that of the protrusion 511 Width, the width of the protrusion 511 refers to the width of the protrusion 511 in the depth direction along the radial direction of the brake member 83, so that the protrusion 511 can be accommodated in the first groove 8211 and the second groove 831 at the same time In between, it can only be accommodated in the second groove 831 . The first groove 8211 and the second groove 831 can be rectangular grooves, but not limited thereto, for example, the bottom of the first groove 8211 and the second groove 831 can be arc-shaped . The elastic element 84 can be a leaf spring. As shown in FIG. The position of an opening 841 can be provided with a second opening, and the elastic element 84 and the second groove 831 can be fixed to each other by screws, the first opening 841 and the second opening, but it is not limited thereto. It can be fixed by card embedding, concave-convex fit, etc.

As shown in FIG. 7, when the anti-overflow needle push rod and the staple cartridge push rod 31 remain relatively stationary, the protrusion 511 is located in the first groove 8211 and the second groove 831 at the same time, that is, at this time The elastic element 84 is in an extended state, and the elastic element 84 pushes the protrusion 511 to enter the first groove 8211, and the brake member 83, the gear 82 and the rack 81 are relatively stationary, that is, the staple cartridge push rod 31 1. The saddle-shaped anti-overflow needle push rod 51 and the push rod 52 are equivalent to one body. When the firing assembly 40 is triggered, the saddle-shaped anti-overflow needle push rod 51 and the push rod 52 move under the drive of the staple cartridge push rod 31, so that the anti-overflow needle The overflow needle 53 can be automatically advanced, the suturing and cutting area defined by the staple cartridge assembly 12 and the staple anvil assembly 13 is switched to a closed state, and the physiological tissue will not overflow the suturing and cutting area defined by the staple cartridge assembly 12 and the staple anvil assembly 13. After the cutting and suturing is completed, the retraction of the staple cartridge assembly 12 is realized by the actuation of the release button 46, and the overflow prevention needle 53 is also automatically pulled back, and the suturing and cutting area defined by the staple cartridge assembly 12 and the nail anvil assembly 13 is switched to an open state. However, after the physiological tissue is placed before the suturing and cutting, sometimes it is necessary to close the suturing and cutting area defined by the staple cartridge assembly 12 and the anvil assembly 13 in advance, which can be achieved by manually advancing the overflow prevention needle 53 .

As shown in FIG. 8 , manually push the force applying handle 512 toward the distal end of the medical stapler so that the projection 511 moves toward the direction of the elastic element 84, and the projection 511 compresses the elastic element 84 so that the projection 511 breaks away from the first groove 8211, And act on the gear 82 to rotate on the rack 81 . Since the gear 82 can move relative to the rack 81 at this time, that is, the movement of the anti-overflow needle push rod can be realized at this time, while the staple cartridge push rod 31 does not move, and the movement of the anti-overflow needle push rod is no longer restricted by the firing assembly 40; continue Manually push the force application handle 512 to make the gear 82 rotate relative to the brake member 83. At this time, the gear 82 moves on the rack 81, and the saddle-shaped anti-overflow needle push rod 51 and the push rod 52 advance the anti-overflow needle 53, and the staple bin The suture cutting area defined by the assembly 12 and the nail anvil assembly 13 can be closed, that is, at this time, the advance sealing of the suture cutting area defined by the staple cartridge assembly 12 and the nail anvil assembly 13 is realized by manually advancing the overflow prevention needle 53 .

The installation process of the above-mentioned medical stapler can be to firstly install the elastic element 84 in the brake part 83, and then install the elastic element 84 and the brake part 83 into the accommodating space 821 of the gear 82 as a whole, and finally, put the elastic The element 84 , the stopper 83 and the gear 82 are integrally installed between the anti-overflow needle push rod and the staple cartridge push rod 31 , that is, the protrusion 511 is inserted into the first groove 8211 and the second groove 831 .

To sum up, one end of the anti-overflow needle push rod in the utility model is provided with a bump 511, and one end of the magazine push rod 31 is provided with a rack 81, and the gear 82 and the brake part 83 are used as the anti-overflow needle push rod. The connecting part between the rod and the staple cartridge push rod 31 can realize the manual advancement of the anti-overflow needle 53, thereby realizing the early closure of the suture cutting area. The medical stapler of the present utility model can realize manual and automatic operation at the same time.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible implementation modes of the present utility model, and they are not used to limit the protection scope of the present utility model. Embodiments or modifications should be included within the protection scope of the present utility model.

Claims (10)

1. a Medical stapler, comprise nail anvil seat, anti-overflow pin and nail bin push rod, wherein, described nail anvil seat comprises the receiving mouth of allowing that Human Physiology tissue passes through, described anti-overflow pin can move between the second position of the primary importance and closed described receiving mouth of opening described receiving mouth, it is characterized in that, described Medical stapler comprises:

Tooth bar, is arranged at described nail bin push rod near-end, and described tooth bar is distally extended by described nail bin push rod near-end;

Hollow gear, engages with described tooth bar, and it comprises an accommodation space, and the first groove be communicated with described accommodation space;

Brake component, described brake component is arranged in described accommodation space, and described brake component has the second groove;

Flexible member, is arranged in described second groove; And

Anti-overflow pin push rod, described anti-overflow pin push rod has a projection, and described projection abuts described flexible member;

Wherein, when described anti-overflow pin push rod and described nail bin push rod keep geo-stationary, described projection protrudes out described second groove and enters described first groove of described gear, now described brake component, described gear and described tooth bar geo-stationary under the effect of described flexible member; When the relatively described nail bin push rod of described anti-overflow pin push rod is to described Medical stapler distal movement, described projection compresses described flexible member and makes described projection depart from described first groove, and acts on described gear and rotate on described tooth bar.

2. Medical stapler as claimed in claim 1, it is characterized in that, the inner surface of described accommodation space is arc-shaped, and the outer surface of the corresponding described accommodation space of described brake component is the arc-shaped coordinating described accommodation space inner surface.

3. Medical stapler as claimed in claim 1, is characterized in that, described first groove axially runs through described gear in described gear.

4. Medical stapler as claimed in claim 3, is characterized in that, described second groove axially runs through described brake component in described brake component.

5. Medical stapler as claimed in claim 1, it is characterized in that, the A/F of the first groove equals the A/F of the second groove.

6. Medical stapler as claimed in claim 5, it is characterized in that, the internal diameter of described first groove equals the internal diameter of described second groove.

7. Medical stapler as claimed in claim 1, it is characterized in that, the degree of depth of described first groove in described gear radial direction is less than the width of described projection; The degree of depth of described second groove in described gear radial direction is greater than the width of described projection.

8. Medical stapler as claimed in claim 1, it is characterized in that, described first groove and described second groove are rectangular channel.

9. Medical stapler as claimed in claim 1, it is characterized in that, described flexible member is spring leaf.

10. Medical stapler as claimed in claim 1, it is characterized in that, described anti-overflow pin push rod is provided with force handle, and described projection is arranged at the far-end of described force handle.